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Bus/Core Ratio for Intel Processor

November 2nd, 2010 Leave a comment Go to comments

Many readers asked question about the Bus/Core ratio in pretty much every processor specification from Intel. For example if we look at the specification


That corressponds to Intel® Xeon® Processor X5460 , the Bus/Core ration has been mentioned as 9.5.However, there is scant information from intel about the definition of the Bus/Core ratio.

Typically the front side Bus runs at some “Clock Frequency” and their is a clock frequency the corressponds to the processor core clock.

The Bus/Core ratio, in broad, terms relates these two clock frequency. It is very popular term among the gamers and overclockers who wish to keep the bus speed same white try to increase the core frequency using multiplier. There should be software as well as hardware support to be able to do that.

We invite industry experts to comment on the Bus/Core ration definition, its use and what it means to the readers. Please feel free to ask additional questions in the comment section.

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  1. John Hingley
    November 2nd, 2010 at 10:34 | #1

    In your particular Intel example, the FSB has been listed as 1333 MHz. Since the FSB here shifts the data 4 times in a clock cycle, the real clock in 1333/4 Mhz = 333.25 MHz.

    So we calculate the Bus/core ratio as the ration of the core frequency 3.16 GHz / 333.35 MHz = 9.5

    Did you clarify it or confused ?